Initial revision

1 files changed, 172 insertions, 0 deletions

diff --git a/progs/redbook/aapoly.c b/progs/redbook/aapoly.c
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+/*
+ * Copyright (c) 1993-1997, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED 
+ * Permission to use, copy, modify, and distribute this software for 
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that 
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission. 
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ * 
+ * US Government Users Restricted Rights 
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
+ */
+
+/*
+ *  aapoly.c
+ *  This program draws filled polygons with antialiased
+ *  edges.  The special GL_SRC_ALPHA_SATURATE blending 
+ *  function is used.
+ *  Pressing the 't' key turns the antialiasing on and off.
+ */
+#include <GL/glut.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+GLboolean polySmooth = GL_TRUE;
+
+static void init(void)
+{
+   glCullFace (GL_BACK);
+   glEnable (GL_CULL_FACE);
+   glBlendFunc (GL_SRC_ALPHA_SATURATE, GL_ONE);
+   glClearColor (0.0, 0.0, 0.0, 0.0);
+}
+
+#define NFACE 6
+#define NVERT 8
+void drawCube(GLdouble x0, GLdouble x1, GLdouble y0, GLdouble y1,
+        GLdouble z0, GLdouble z1)
+{
+   static GLfloat v[8][3];
+   static GLfloat c[8][4] = {
+      {0.0, 0.0, 0.0, 1.0}, {1.0, 0.0, 0.0, 1.0},
+      {0.0, 1.0, 0.0, 1.0}, {1.0, 1.0, 0.0, 1.0},
+      {0.0, 0.0, 1.0, 1.0}, {1.0, 0.0, 1.0, 1.0},
+      {0.0, 1.0, 1.0, 1.0}, {1.0, 1.0, 1.0, 1.0}
+   };
+
+/*  indices of front, top, left, bottom, right, back faces  */
+   static GLubyte indices[NFACE][4] = {
+      {4, 5, 6, 7}, {2, 3, 7, 6}, {0, 4, 7, 3},
+      {0, 1, 5, 4}, {1, 5, 6, 2}, {0, 3, 2, 1}
+   };
+
+   v[0][0] = v[3][0] = v[4][0] = v[7][0] = x0;
+   v[1][0] = v[2][0] = v[5][0] = v[6][0] = x1;
+   v[0][1] = v[1][1] = v[4][1] = v[5][1] = y0;
+   v[2][1] = v[3][1] = v[6][1] = v[7][1] = y1;
+   v[0][2] = v[1][2] = v[2][2] = v[3][2] = z0;
+   v[4][2] = v[5][2] = v[6][2] = v[7][2] = z1;
+
+#ifdef GL_VERSION_1_1
+   glEnableClientState (GL_VERTEX_ARRAY);
+   glEnableClientState (GL_COLOR_ARRAY);
+   glVertexPointer (3, GL_FLOAT, 0, v);
+   glColorPointer (4, GL_FLOAT, 0, c);
+   glDrawElements (GL_QUADS, NFACE*4, GL_UNSIGNED_BYTE, indices);
+   glDisableClientState (GL_VERTEX_ARRAY);
+   glDisableClientState (GL_COLOR_ARRAY);
+#else
+   printf ("If this is GL Version 1.0, ");
+   printf ("vertex arrays are not supported.\n");
+   exit(1);
+#endif
+}
+
+/*  Note:  polygons must be drawn from front to back
+ *  for proper blending.
+ */
+void display(void)
+{
+   if (polySmooth) {
+      glClear (GL_COLOR_BUFFER_BIT);
+      glEnable (GL_BLEND);
+      glEnable (GL_POLYGON_SMOOTH);
+      glDisable (GL_DEPTH_TEST);
+   }
+   else { 
+      glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+      glDisable (GL_BLEND);
+      glDisable (GL_POLYGON_SMOOTH);
+      glEnable (GL_DEPTH_TEST);
+   }
+
+   glPushMatrix ();
+      glTranslatef (0.0, 0.0, -8.0);    
+      glRotatef (30.0, 1.0, 0.0, 0.0);
+      glRotatef (60.0, 0.0, 1.0, 0.0); 
+      drawCube(-0.5, 0.5, -0.5, 0.5, -0.5, 0.5);
+   glPopMatrix ();
+
+   glFlush ();
+}
+
+void reshape(int w, int h)
+{
+   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   gluPerspective(30.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+}
+
+/* ARGSUSED1 */
+void keyboard(unsigned char key, int x, int y)
+{
+   switch (key) {
+      case 't':
+      case 'T':
+         polySmooth = !polySmooth;
+         glutPostRedisplay();
+         break;
+      case 27:
+         exit(0);  /*  Escape key  */
+         break;
+      default:
+         break;
+   }
+}
+
+/*  Main Loop
+ */
+int main(int argc, char** argv)
+{
+   glutInit(&argc, argv);
+   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB 
+                        | GLUT_ALPHA | GLUT_DEPTH);
+   glutInitWindowSize(200, 200);
+   glutCreateWindow(argv[0]);
+   init ();
+   glutReshapeFunc (reshape);
+   glutKeyboardFunc (keyboard);
+   glutDisplayFunc (display);
+   glutMainLoop();
+   return 0;
+}
+